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CATALYTIC KINETIC PHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF NITRITE IN FRESH FRUITS AND VEGETABLES

Hui Xu

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Abstract

Based on the catalytic effect of nitrite on the color fading reaction of oxidation of thymol blue by potassium bromate in dilute phosphoric acid solution, a catalytic kinetic photometric method for the determination of trace amounts of nitrite was developed. The linear range for nitrite was found to be 0～6.5μg/25ml and the limit of detection to be 0.67ng·ml -1. The method has been applied to the determination of nitrite in several fresh fruit and vegetable samples with satisfactory results.

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What this paper is about

Based on the catalytic effect of nitrite on the color fading reaction of oxidation of thymol blue by potassium bromate in dilute phosphoric acid solution, a catalytic kinetic photometric method for the determination of trace amounts of nitrite was developed. The linear range for nitrite was found to be 0～6.5μg/25ml and the limit of detection to be 0.67ng·ml -1. The method has been applied to the determination of nitrite in several fresh fruit and vegetable samples with satisfactory results.

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Available abstract

Based on the catalytic effect of nitrite on the color fading reaction of oxidation of thymol blue by potassium bromate in dilute phosphoric acid solution, a catalytic kinetic photometric method for the determination of trace amounts of nitrite was developed. The linear range for nitrite was found to be 0～6.5μg/25ml and the limit of detection to be 0.67ng·ml -1. The method has been applied to the determination of nitrite in several fresh fruit and vegetable samples with satisfactory results.

Key concepts: Potassium bromate, Nitrite, Chemistry, Catalysis, Detection limit, Phosphoric acid, Trace Amounts, Inorganic chemistry

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